<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
  </head>

  <body>
    <div id="app">
      <div :style="{backgroundColor:'red',width:'200px',height:'200px'}">
        111
      </div>
      <div :style="boxStyle">222</div>
    </div>
    <script>
      Vue.config.productionTip = false;
      //实例化Vue
      const vm = new Vue({
        el: "#app",
        data() {
          return {
            boxStyle: {
              backgroundColor: "green",
              width: "200px",
              height: "200px",
            },
          };
        },
      });
    </script>
  </body>
</html>
